no solution, they are all the same line
D; 1 and 6 are being added together first then divided by 7, so need the parentheses around 1 and 6
Answer:
10 degrees
Step-by-step explanation:
1.) every triangle has angles that add up to 180 degrees
2.) a right triangle has a right angle and two acute angles
3.) right=90 degrees; acute=<90 degrees
4.) 90+80=170
5.) 180-170=10
